How can I show my teeth when I smile or talk? (photos)

It does not appear that you are smiling as much as you really COULD, so any advice may be incomplete. Porcelain veneers are likely the best option.  A "normal" smile has the corners of the mouth curl up a bit and the upper lip raises to display most of the tooth, often to the gum-line.  Teeth are normally an average of 8.5-10 mm, so this may be the ideal amount for you to display.  However, the tips of the front teeth should be within a specific part of the face, so if we simply made your teeth longer, it may throw off the balance and symmetry of your face.  This would mean a better display of teeth is not to make them longer as much as to simply have the lip move more than it does.A consultation with an experienced cosmetic dentist and/or periodontist may shed more light on your options.

There is a way to improve this, and it can be with veneers, but needs to be a makeover to do the adjustments to improve the way you see the uppers when you smile, also there is somethings to arrange on lower teeth, also. you will modify shape, size and even color if you want to,a smile analysis is important to see the more aesthetical layout of your from teeth.